Only slightly tangental and highlights my lack...
...of more current knowledge concerning those of the female persuasion, but: What exactly is a muffin top and why is it called that?

EDIT AFTER READING REPLIES: Yikes, it's even worse than I thought. As a mate of mine once said, 'Just because it may be the fashion to show a little midriff, it doesn't necessarily mean that a given individual should, especially an individual that has been given more than their share at the Greggs counter'.
(thatblokeoverthere not quite as much an arsehole as I thought, Mon 20 Oct 2008, 14:04, 5 replies)

It's when a girl wears tight low-slung jeans and fat hangs over the top,
looking like a muffin.
(Juan Quar is clinging to her front teeth on, Mon 20 Oct 2008, 14:08, closed)

It's the roll of fat that flaps over your jeans.
Named because it looks like the side of a muffin.
( girlinthehole, Mon 20 Oct 2008, 14:09, closed)

A muffin top is
The fold of flab that hangs over the tops of fat girls Hipster jeans. So called because it looks like the top of a freshly cooked Muffin that has over spilled it's paper casing.

Hope that this helps...

Love from Jayne, who although a little over weight does not have a muffin top or Bingo Wings!
( Rev. Jayneflakes Buy my book, I need the cash for drugs and hookers, Mon 20 Oct 2008, 14:10, closed)

Muffin tops
Happen on skinny girls who force themselves into tight, low-cut jeans as well, plus it makes their asses look like giant rectangles. Not a good look for anyone, really!
(louveciennes , Volvospotter, Mon 20 Oct 2008, 17:09, closed)

Google image search
will illustrate it nicely for you.

Even more fun- back boobs.
( The Resident Loon Not a demographic. Do not measure., Mon 20 Oct 2008, 14:13, closed)